Lチカの方法(ArduinoIDE)

2023.05.05



概要

開発環境：ArdinoIDE
→ダウンロードしていない人はこちら

Lチカ(LEDの点灯と消灯を繰り返す)のやり方を解説
サンプルコード：BlinkWithoutDelay.ino
プログラム概要：1秒おきにLED1の点灯と消灯を入れ替える

ピン情報はこちらを参照
今回使用するLED1 のピン番号は16

Lチカ解説

「Tool」→「Board」の順で使用するボードの設定をRL78G23にする。
(1つ下のCOM設定を忘れがち)

「File」→「Examples」→「02.Digital」→「BlinkWithoutDelay」の順でサンプルスケッチ例を開く。

BlinkWithoutDelayのソースコード

/*
  Blink without Delay

  Turns on and off a light emitting diode (LED) connected to a digital pin,
  without using the delay() function. This means that other code can run at the
  same time without being interrupted by the LED code.

  The circuit:
  - Use the onboard LED.
  - Note: Most Arduinos have an on-board LED you can control. On the UNO, MEGA
    and ZERO it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN
    is set to the correct LED pin independent of which board is used.
    If you want to know what pin the on-board LED is connected to on your
    Arduino model, check the Technical Specs of your board at:
    https://www.arduino.cc/en/Main/Products

  created 2005
  by David A. Mellis
  modified 8 Feb 2010
  by Paul Stoffregen
  modified 11 Nov 2013
  by Scott Fitzgerald
  modified 9 Jan 2017
  by Arturo Guadalupi

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/BlinkWithoutDelay
*/

// constants won't change. Used here to set a pin number:
const int ledPin = LED_BUILTIN;  // the number of the LED pin

// Variables will change:
int ledState = LOW;  // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;  // will store last time LED was updated

// constants won't change:
const long interval = 1000;  // interval at which to blink (milliseconds)

void setup() {
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the difference
  // between the current time and last time you blinked the LED is bigger than
  // the interval at which you want to blink the LED.
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
  }
}

Uploadをクリックし、RL78G23にプログラムを書き込む。
左の☑を押さなくてもコンパイルをして書き込むことができる。
(書き込みはRL78G23を繋ぐ必要あり)
書き込みはせず、コンパイルだけ試したい場合は左の☑を押すとできる。

1秒おきにLEDの消灯と点灯が入れ替われば成功　　　　　　　　　　　　　　　　　　

サンプルコードはdelayを使用せずにLチカしている。
delayを使用した1秒おきにＬチカするサンプルコードを作成したので共有

char pin_number = 16;//LED1なら16,LED2なら15

void setup() {
  pinMode(pin_number, OUTPUT);//出力設定
}

void loop() {
  digitalWrite(pin_number,1);//LED消灯
  delay(1000);               //1秒間遅延
  digitalWrite(pin_number,0);//LED点灯
  delay(1000);               //1秒間遅延
}





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